If so, the Food Standards Agency would like to hear from you. Here is a post I picked up in Allergy Best Buys newsletter:
Some individuals report adverse effects which they relate to the consumption of the artificial sweetener aspartame. The Food Standards Agency is undertaking a double blind placebo controlled study to investigate these effects. The study started in July 2009 and is expected to take 18 months. The FSA hope to publish the results early in 2011.
For the study to be successful they need further volunteers who believe they have suffered an adverse effect following consumption of aspartame. The research will take place at the University of Hull and all appropriate participant travel costs and if necessary overnight accommodation expenses will be met. There is further information about the study here: http://www.food.gov.uk/news/newsarchive/2009/jun/aspartame or you can phone Dr Natalie Thatcher on 01482 675387